feat: initial plan

pkg/config/config.go

@@ -0,0 +1,55 @@
+// Package config defines PgTidy's formatter (and, later, linter) configuration.
+//
+// Defaults encode the project house style reverse-engineered from the corpus.
+// A future change will load/merge these from a discovered .pgtidy.yaml file.
+package config
+
+// Case controls keyword/identifier casing.
+type Case string
+
+const (
+	CaseUpper Case = "upper"
+	CaseLower Case = "lower"
+	// CasePreserve leaves the token text unchanged.
+	CasePreserve Case = "preserve"
+)
+
+// CommaStyle controls where separators sit in multi-line lists.
+type CommaStyle string
+
+const (
+	// CommaLeading puts the comma at the start of the continuation line
+	// (",col"), the house style.
+	CommaLeading CommaStyle = "leading"
+	// CommaTrailing puts the comma at the end of the preceding line ("col,").
+	CommaTrailing CommaStyle = "trailing"
+)
+
+// Style is the formatter configuration.
+type Style struct {
+	// Indent is one indentation level (default two spaces).
+	Indent string
+	// Newline is the line terminator emitted by the formatter.
+	Newline string
+	// KeywordCase controls SQL keyword casing (types excluded — see TypeCase).
+	KeywordCase Case
+	// IdentCase controls unquoted identifier casing (quoted identifiers are
+	// never touched).
+	IdentCase Case
+	// TypeCase controls built-in type-name casing.
+	TypeCase Case
+	// Commas controls list separator placement.
+	Commas CommaStyle
+}
+
+// Default returns the house-style configuration.
+func Default() Style {
+	return Style{
+		Indent:      "  ",
+		Newline:     "\n",
+		KeywordCase: CaseUpper,
+		IdentCase:   CaseLower,
+		TypeCase:    CaseLower,
+		Commas:      CommaLeading,
+	}
+}